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On the performance of the load balanced shortest path routing 负载均衡最短路径路由的性能研究
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291292
Nataša Maksić, P. Knezevic, Marija Antic, A. Smiljanic
{"title":"On the performance of the load balanced shortest path routing","authors":"Nataša Maksić, P. Knezevic, Marija Antic, A. Smiljanic","doi":"10.1109/PACRIM.2009.5291292","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291292","url":null,"abstract":"In this paper we present implementation and analysis of the novel routing protocol - the two-phase load balanced shortest path routing (LB-SPR). This routing scheme represents the modification of the existing OSPF protocol, and can be optimized to achieve the maximum guaranteed node traffic. Also, the proposed scheme allows the simple and straightforward process of bandwidth reservation, important for multimedia applications. In a testing network environment, we compare the performance of LB-SPR with OSPF, and confirrm the better traffic distribution in the case of LB-SPR, which allows to route higher traffic loads. Then we analyze the jitter, as the possible critical aspect of load balancing, and show that the use of load balancing does not crucially affect the quality of transmission.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117346805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Practical performance evaluation of VoWLAN handover based on frame retries 基于帧重试的VoWLAN切换的实际性能评估
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291302
Sung-il Bang, Yuzo Taenaka, S. Kashihara, K. Tsukamoto, S. Yamaguchi, Y. Oie
{"title":"Practical performance evaluation of VoWLAN handover based on frame retries","authors":"Sung-il Bang, Yuzo Taenaka, S. Kashihara, K. Tsukamoto, S. Yamaguchi, Y. Oie","doi":"10.1109/PACRIM.2009.5291302","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291302","url":null,"abstract":"In the near future, wireless local area networks (WLANs) will overlap to provide continuous coverage over a wide area. In such ubiquitous WLANs, a mobile node (MN) freely moves between WLANs with different IP subnets during VoIP communication. However, existing methods cannot sufficiently maintain VoIP quality during handover due to changes of IP address and inappropriate execution of handover. To solve these problems, in our previous paper, we proposed and implemented a seamless handover method employing multi-path transmission and a handover trigger based on frame retries. However, we have not sufficiently shown the effectiveness of our proposed method in a practical environment. Therefore, in this paper, we focus on the two features of our proposed method, i.e., frame retries and multi-path transmission, and present a detailed evaluation of our proposed method in a real environment.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115486827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Weight combining and subchannel allocation to reduce Self Interference in OFDMA-CDM system OFDMA-CDM系统中权值合并和子信道分配减少自干扰
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291363
Norikazu Matsui, Keisuke Mutou, S. Iijima, I. Sasase
{"title":"Weight combining and subchannel allocation to reduce Self Interference in OFDMA-CDM system","authors":"Norikazu Matsui, Keisuke Mutou, S. Iijima, I. Sasase","doi":"10.1109/PACRIM.2009.5291363","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291363","url":null,"abstract":"We propose a subchannel allocation by considering multiuser diversity to reduce Self Interference (SI) which arises due to the destrunction of orthogonality of spreading codes in Orthogonal Frequency Division Multiple Access - Code Division Multiplexing (OFDMA-CDM) system. The conventional OFDMA-CDM does not effectively reduce SI, since it does not consider multiuser diversity. The proposed scheme allocates subchannels to the user who has largest minimum Carrier to Interference Ratio (CIR) since the conventional weight combining is done by minimum channel gain. By doing the proposed subchannel allocation, minimum CIR becomes high and each user can use good subchannels. Due to the effective multiuser diversity, demodulated symbols can be weighted by high channel gain. Since the proposed scheme can generate reliable demodulated symbols, the proposed scheme can reduce SI. The simulation results show that the proposed scheme can improve the BER performance.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114225100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters 三维空时滤波器对天线阵列干扰和相互耦合的衰减研究
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291383
Najith Liyanage, L. Bruton, P. Agathoklis
{"title":"On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters","authors":"Najith Liyanage, L. Bruton, P. Agathoklis","doi":"10.1109/PACRIM.2009.5291383","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291383","url":null,"abstract":"A 3D space-time filtering method is proposed for attenuating undesirable electromagnetic signals that propagate at or close to light speed across the surface of the plane that contains an array of antennas. Such signals may include the so-called radio frequency interference (RFI) that emanate from sources that lie well outside the directions of arrival (DOAs) of the signals of interest (SOIs). They may also include the intra-plane inter-antenna signals that result from the undesirable electromagnetic mutual coupling that exists between rectangularly-spaced antennas in aperture arrays (AAs) and in the focal plane arrays (FPAs) of paraboloidal dishes. Such signals have 3D space-time spectra possessing regions of support (ROSs) that are close to the surface of the 3D spectral light cone. They can therefore be attenuated by means of 3D space-time filters having 3D stopbands that include and encompass the surface of this light cone. Such a 3D space-time filter is described here and used to evaluate the validity of the proposed approach. Numerical results confirm that the proposed method significantly attenuates broadband RFI signals and moderately suppresses mutual coupling.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"399 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124241375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Acquisition of spread spectrum codes with consecutive correlator outputs in the presence of fractional Doppler frequency offset 在存在分数多普勒频偏的情况下，用连续相关器输出扩频码的获取
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291320
Seong-Ro Lee, Hyun Gu Kang, Taehun An, Min-A Jeong, Y. Kim, I. Song, Seokho Yoon
{"title":"Acquisition of spread spectrum codes with consecutive correlator outputs in the presence of fractional Doppler frequency offset","authors":"Seong-Ro Lee, Hyun Gu Kang, Taehun An, Min-A Jeong, Y. Kim, I. Song, Seokho Yoon","doi":"10.1109/PACRIM.2009.5291320","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291320","url":null,"abstract":"A novel code acquisition scheme is proposed for the acquisition in time of spread spectrum codes in the presence of fractional Doppler frequency offset (FDFO). In the proposed acquisition scheme, the decision variable for detection is formed by combining two consecutive correlator outputs so that the influence of the reduction in the correlation peak due to the FDFO can be alleviated. Numerical results show that the proposed acquisition scheme can offer better mean-time-to-synchronization performance than the conventional scheme based on the cell-by-cell detection.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124378636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experiment investigation of sampling point selection in fractional sampling OFDM receiver 分数采样OFDM接收机采样点选择的实验研究
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291265
K. Saito, Toshiya Shinkai, H. Nishimura, Y. Sanada
{"title":"Experiment investigation of sampling point selection in fractional sampling OFDM receiver","authors":"K. Saito, Toshiya Shinkai, H. Nishimura, Y. Sanada","doi":"10.1109/PACRIM.2009.5291265","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291265","url":null,"abstract":"In the IEEE802.11a WLAN standard, orthogonal frequency division multiplexing (OFDM) modulation is employed. Diversity techniques are usually utilized to overcome fading channels in OFDM system. Furthermore, a diversity with a single antenna is desirable because the form factor of the terminal is important. Fractional sampling( FS) scheme is one of the diversity technique with a single antenna. Through FS, it is possible to separate multipath components and obtain diversity gain in OFDM communication. In this paper, a novel sampling point selection scheme according to the frequency response of a channel is proposed. Through the experiment the performance of the FS scheme on a IEEE802.11a WLAN system, it is evaluated. Numerical results through the experiment indicate that sampling point selection scheme according to the frequency response of a channel can achieve path diversity.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"85 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126449649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
High-resolution spectrum estimation for non-coherent source location using the multi-frequency virtual correlation matrix 基于多频虚拟相关矩阵的非相干源定位高分辨率频谱估计
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291261
J. Moulton, S. Kassam
{"title":"High-resolution spectrum estimation for non-coherent source location using the multi-frequency virtual correlation matrix","authors":"J. Moulton, S. Kassam","doi":"10.1109/PACRIM.2009.5291261","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291261","url":null,"abstract":"We explain how multiple frequencies can be used to extend the capabilities of the spectrum estimation method for high-resolution location of multiple non-coherent point sources. The techniques covered in this paper are MUltiple SIgnal Classification (MUSIC), Autoregressive (AR) spectrum estimation and Capon minimum variance spectrum estimation. Our approach uses coarray equivalence to construct a “virtual correlation matrix” with larger size than the correlation matrix that is directly obtainable from the physical array. The larger dimension of the virtual correlation matrix allows for more point sources to be resolved when the spectrum estimation methods are applied. This method will prove to be useful in situations where the number of antenna elements must be limited, but there are many sources.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131827132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Optimal frame-splitting ratio for uncoded and coded transmissions with distributed antennas 分布式天线非编码和编码传输的最优分帧比
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291384
M. Yasutake, Jun Cheng, Chen Sun, Y. Watanabe
{"title":"Optimal frame-splitting ratio for uncoded and coded transmissions with distributed antennas","authors":"M. Yasutake, Jun Cheng, Chen Sun, Y. Watanabe","doi":"10.1109/PACRIM.2009.5291384","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291384","url":null,"abstract":"The frame splitting (FS) for the downlink transmission from a base station (BS) with distributed antennas to a mobile station is studied. A data frame from the BS is split into two portions that are transmitted consecutively from the distributed antennas. For uncoded transmission, the bit error rate (BER) is formulated as a function of the FS ratios, and an analytical optimal FS ratios is derived to achieve the lowest BER over AWGN and Rayleigh fading channels, respectively. For coded transmission, an optimal FS ratio is conjectured based the analytical result of uncoded transmission. Furthermore, this optimal FS ratio is verified by simulation. For both uncoded and coded transmissions, the optimal FS ratio depends only on the ratio of the two characteristic SNRs.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":" 45","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120832939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SWH: A Small-World Heuristic for future network SWH:未来网络的小世界启发式
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291366
Samer Damaj, T. Goubier, B. Pottier
{"title":"SWH: A Small-World Heuristic for future network","authors":"Samer Damaj, T. Goubier, B. Pottier","doi":"10.1109/PACRIM.2009.5291366","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291366","url":null,"abstract":"Graphs with a minimum diameter have applications in the design of building-block switching systems, communication networks [1], and distributed computer systems [2]. Several methods of constructing directed graphs with a small diameter are proposed [3]. This paper presents a heuristic network topology that allows a wide trade-off between node degree, and diameter. This called “Small-World Heuristic” (SWH) that feature minimum diameter properties using only nodes of degree 4. The “SWH” is highly clustered like a regular graph where the edges are randomly rewired with a gaussian distribution and has a small characteristic path length, like a random graph. This heuristic explores different graphs to suitable for large parallel computer networks.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129925654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Generating Toffoli networks from ESOP expressions 从ESOP表达式生成Toffoli网络
2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2009-10-23 DOI: 10.1109/PACRIM.2009.5291282
Yasaman Sanaee, G. Dueck
{"title":"Generating Toffoli networks from ESOP expressions","authors":"Yasaman Sanaee, G. Dueck","doi":"10.1109/PACRIM.2009.5291282","DOIUrl":"https://doi.org/10.1109/PACRIM.2009.5291282","url":null,"abstract":"In this paper a new heuristic ESOP-based synthesis method for Toffoli networks is proposed. This synthesis method takes advantage of the shared-ESOP cubes among the outputs to generate a cascade of Toffoli gates. The method is suitable to generate circuits for functions with large number of input variables. A greedy approach is utilized to select pairs among the different outputs with common ESOP-cubes. The shared terms need only to be realized once and the result can then be transferred to the second output, and thus reducing the number of Toffoli gates. The synthesis algorithm has been applied to a set of benchmark functions. Experimental results show that the algorithm can generate circuits with reduced quantum cost for virtually all functions. Template applications can further improve the results.","PeriodicalId":217751,"journal":{"name":"2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132649454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
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